EP2418040A1 - Method of controlling a device for laser welding - Google Patents
Method of controlling a device for laser welding Download PDFInfo
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- EP2418040A1 EP2418040A1 EP11175574A EP11175574A EP2418040A1 EP 2418040 A1 EP2418040 A1 EP 2418040A1 EP 11175574 A EP11175574 A EP 11175574A EP 11175574 A EP11175574 A EP 11175574A EP 2418040 A1 EP2418040 A1 EP 2418040A1
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- projector
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- default value
- image sensor
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/04—Automatically aligning, aiming or focusing the laser beam, e.g. using the back-scattered light
- B23K26/044—Seam tracking
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/03—Observing, e.g. monitoring, the workpiece
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/08—Devices involving relative movement between laser beam and workpiece
- B23K26/082—Scanning systems, i.e. devices involving movement of the laser beam relative to the laser head
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/20—Bonding
- B23K26/21—Bonding by welding
- B23K26/24—Seam welding
Definitions
- the invention relates to a method with which the accuracy of the guidance of the processing laser of joining devices, which are controlled by a scanner optics, in particular when large changes in height occur relative to the scanner optics in the course of the seam to be joined, is sustainably improved.
- the device has a projector which is moved with the scanner optics and which serves to project measuring light in the form of measuring structures onto the workpiece to be processed, and an image sensor which moves with the scanner optics and which is sensitive in the wavelength range of the measuring light emitted by the projector ,
- the projector is arranged outside the beam path of the scanner optics and the measurement light emitted by it consists of at least one line which runs transversely to the longitudinal direction of the seam to be produced on the workpiece and preferably extends over the entire working field of the scanner optics. With the help of the projector, in the seam longitudinal direction by means of the so-called. Default value, a certain flow to the impact position of the laser beam can be determined.
- the DE 10 2006 004 919 A1 describes a laser beam welding head with a welding beam and means for optically detecting the position of a weld at a leading measuring position, wherein a correction signal generated based on a deviation of the weld from a desired position can be used directly and without preprocessing to correct the position of the welding beam.
- the DE 10 2008 056 695 A1 describes a laser processing head having a lighting device with a first light source for illuminating a work area of a workpiece to be machined, a light section device with a second light source for generating a light line within the work area, and a camera for observing the work area, wherein an optical bandpass filter is arranged in front of the camera and the first and second light sources are arranged to have a radiation maximum in the wavelength passage area of the band-pass filter.
- the EP 2 062 674 A1 describes a method for preparing a laser welding process, wherein with a sensor device, the position of a joint on a workpiece in a first measuring range leading to a laser beam position, in a second measuring range at the laser beam position and / or in a third measuring range trailing to the laser beam position, and the laser beam position be detected in the second measuring range, and wherein the positions of the joint in the respective measuring ranges and the laser beam position for adjusting the position, the orientation and / or the coordinate system of the sensor device and / or a laser processing head relative to the workpiece are compared.
- the device after DE 10 2009 057 209 A1 and also other currently used solutions make their calculations from a constant work flow (fore ahead, where the measurements required to operate the device are made) between the laser process and the at least one measurement line projected onto the device. From the measurements will be Correction values determined. At a calculated point in time at which the laser beam would have to be located at the corresponding measuring location, the corrections corresponding to the correction values are then carried out.
- the optical axis of the projector In order to obtain favorable triangulation angles, the optical axis of the projector must be tilted relative to the optical axis of the processing laser beam. In such a tilted arrangement, however, height changes (elevations or depressions) on the workpiece for reasons of geometry lead to a shift of the real flow and thus to deviations between the default value of the flow and the real-setting flow.
- the object of the invention is to find a method with which the accuracy of the guidance of the processing laser in joining devices by means of a scanner optics be controlled, even when longitudinally to the seam to be produced occurring height fluctuations between scanner optics and component is sustainably improved.
- the inventive method is used to control a joining device with a processing laser
- the scanner optics is equipped with at least one external projector.
- the projector serves to project measuring light in the form of measuring structures onto the workpiece to be machined.
- the measuring light is detected by an image sensor moving with the scanner optics and sensitive in the wavelength range of the measuring light.
- the scanner optics operates on the principle of pre-objective scanning or post-objective scanning and is moved by means of a guide machine relative to the workpiece to be machined.
- the beam path of the scanner optics is guided by means of one or more active and / or passive deflection units.
- the projector is located outside the beam path of the scanner optics and its optical axis with respect to the optical axis of the laser by 5 ° to 60 °, preferably 10 ° to 25 ° tilted.
- the measuring light emitted by the projector consists of at least one line which runs transversely to the longitudinal direction of the seam to be produced.
- the default value of the flow of the measurement light relative to the impact position of the laser beam in the seam longitudinal direction is changed in a targeted manner.
- All known methods operate with a fixed default value of the flow, but the real flow can also vary in these methods, as discussed above, for geometric reasons.
- a projector In order to freely specify the flow of the measurement light to the position of incidence of the laser beam (within the scope of the equipment), a projector is used, whose measurement light, for example, by changing its tilt angle or translational movement of the entire projector or by means arranged in the outgoing beam path of the projector, active deflection unit, can be moved independently of the guide machine. Finally, the default value of the forward can also be changed by means of the scanner optics.
- image signals from the measuring light are recorded by the image sensor during the generation of the weld.
- the default value of the flow is either initially held firmly on the default value of the workflow or the default value of the flow is cyclically varied.
- the image sensor receives image signals during the generation of the seam.
- the image signals are recorded during each variation, which usually begins with the default value of the working advance and extends to larger default values (farther from the point of incidence of the laser beam).
- the cyclical variations of the default values of the pre-scan can occur exclusively within the image area of the image sensor, or the image area of the image sensor to reach even greater pre-set values (than that in the image area of the image sensor) during the variation of the pre-set values Measuring light tracked by the scanner optics. While tracking the image sensor, since the working laser and the image sensor use the same optics, the working laser is also moved, but the variation of the default values is limited (speed, amplitude), which are readily tolerated by the welding process.
- the topology of the workpiece in the vicinity of the seam to be produced is determined by means of a triangulation method, preferably the light-section method.
- the default values for the work flow are then determined adjusted so that over the entire course of the seam to be produced in each case the deviations caused by height variations deviations of the real working approach are compensated by the target value of the work flow.
- the real work flow can be kept at its optimum value and the correction values determined by the scanner optics are used at the positions intended for this purpose.
- the variant with fixed default values of the flow only the topology data before and exactly at the location of the measuring light can be used, while in the variant with cyclical variation of the default values of the flow also in preview, i. worked with the topology data in front of the place of the measuring light, and as a result can be regulated even more precisely.
- the variant with cyclic variation is technologically more complex.
- the method according to the invention can also be used to not record the real work flow but to set it to such a small value that the quality of the image signals is just as good that they can be used for control. In this way, it is possible to always get used to the optimum of Nachdusstabilmaschine and accuracy of the control in the welding process.
- a number of individual images per unit of time is taken, which is larger (at least twice, usually five times as large) as the number of individual images required for the seam guide.
- the signal-to-noise ratio is determined. If the signal / noise ratio exceeds a predetermined value, the image is classified as good (good image), as soon as this value is exceeded, the image is considered bad (bad image).
- the error quotient (ratio of bad images to good images) is determined from the individual images taken per time unit.
- the default value (by a small value, eg, 0.1 to 5 mm) of the leader is increased when the error quotient of the frames exceeds a certain value and decreases (also by a small value) as soon as the error quotient falls below a certain value. Recording the Single images and the subsequent change of the preset value of the flow takes place during the entire welding process.
- the method according to the invention is well suited for combination with the already known, so-called "on-the-fly method" in which the operating speed of the laser is temporarily increased by moving the laser to move the laser through the guide machine is added through the scanner optics.
- the uncorrected measuring line 8a Upon impact of the emitted from the projector 7 measuring light 8, which consists here of a line on a workpiece 11, which is not flat, but elevations 12 or depressions, the uncorrected measuring line 8a would impinge on the workpiece at a position 13a. In the calculation of the corrections of the scanner optics, however, would assume the desired position 13b. Between the real work flow (corresponding to position 13a) and the setpoint of the work flow (corresponding to position 13b), a deviation 14 would thus occur.
- a cyclic variation of the desired flow in the seam longitudinal direction 9 is constantly performed and determined from the image data obtained with the aid of the light section method, the topology of the workpiece.
- the deviation 14 can be compensated by means of the topology data in that the original (no compensation of the error caused by the height change) measuring line 8a is tilted by a correction angle ⁇ (tilting of the Projector 7 or an active deflection unit 3), that the original, geometrically shifted working flow 13a is pivoted to the setpoint corresponding to the working flow 13b (line 8b).
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Laser Beam Processing (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren, mit dem die Genauigkeit der Führung des Bearbeitungslasers von Fügevorrichtungen, die mittels einer Scanner-Optik gesteuert werden, insbesondere wenn im Verlauf der zu fügenden Naht große Änderungen der Höhe relativ zur Scanner-Optik auftreten, nachhaltig verbessert wird.The invention relates to a method with which the accuracy of the guidance of the processing laser of joining devices, which are controlled by a scanner optics, in particular when large changes in height occur relative to the scanner optics in the course of the seam to be joined, is sustainably improved.
Aus dem Stand der Technik sind bereits Fügevorrichtungen bekannt, mit denen in Standardanwendungen bei der Führung des Bearbeitungslasers hohe Genauigkeiten erreicht werden.Fastening devices are already known from the prior art with which high accuracies are achieved in standard applications when guiding the machining laser.
So wird in
Die
Die
Bei der Bearbeitung von Werkstücken mit flacher Topologie, d.h. Werkstücken, bei denen im Nahtverlauf keine großen Änderungen der Höhe (des Abstands zwischen Werkstück und Scanner-Optik), wie z.B. steile Flanken oder Stufen, auftreten, wird mit der Vorrichtung sicher erreicht, dass die realen Vorläufe den Vorgabewerten der Vorläufe weitgehend entsprechen und infolgedessen die mindestens eine Linie des Messlichts in Nahtlängsrichtung immer einen definierten Abstand zur Auftreffposition des Laserstrahls einhält.When machining flat topology workpieces, i. Workpieces that do not undergo large changes in height (the distance between the workpiece and the scanner optics) along the seam, such as those shown in Figs. steep flanks or steps occur, is achieved with the device sure that the real heats largely meet the default values of the heats and consequently the at least one line of the measuring light in the seam longitudinal direction always maintains a defined distance to the impact position of the laser beam.
Die Vorrichtung nach
Um günstige Triangulationswinkel zu erhalten, muss die optische Achse des Projektors gegenüber der optischen Achse des Bearbeitungslaserstrahls gekippt angeordnet sein. Bei einer solchen gekippten Anordnung führen jedoch Höhenänderungen (Erhebungen oder Senken) auf dem Werkstück aus Geometriegründen zu einer Verschiebung des realen Vorlaufs und damit zu Abweichungen zwischen dem Vorgabewert des Vorlaufs und dem sich real einstellenden Vorlauf.In order to obtain favorable triangulation angles, the optical axis of the projector must be tilted relative to the optical axis of the processing laser beam. In such a tilted arrangement, however, height changes (elevations or depressions) on the workpiece for reasons of geometry lead to a shift of the real flow and thus to deviations between the default value of the flow and the real-setting flow.
Diese Abweichung des realen Vorlaufs vom Vorgabewert bringt zwei Nachteile mit sich.This deviation of the real flow from the default value has two disadvantages.
Da erstens in den bekannten Vorrichtungen bei den Berechnungen der Korrekturwerte davon ausgegangen wird, dass der reale Arbeitsvorlauf mit dem Sollwert des Arbeitsvorlaufs (der "gewollte" Arbeitsvorlauf) übereinstimmt, werden bei Höhenänderungen im Nachverlauf die Korrekturen zur falschen Zeit (und infolgedessen auch am falschen Ort) durchgeführt.Firstly, in the known devices, in the computation of the correction values, it is assumed that the real working advance coincides with the set value of the work-flow (the "intended" working-ahead), then with post-level height changes, the corrections become the wrong time (and consequently also in the wrong place ) carried out.
Zweitens führt die Abweichung des realen Vorlaufs vom Sollwert zu einem Arbeitsvorlauf, der nicht optimal ist. Da das Bildsignal aufgrund der durch den Schweißprozess verursachten Umwelteinflüsse (wie z.B. Schweißdampf) umso schlechter wird, je kleiner der Vorlauf gewählt wird (Verringerung der Nachführstabilität), anderseits jedoch die Genauigkeit der Regelung mit zunehmendem Vorlauf abnimmt, muss bei Scanner-Optiken der Sollwert des Arbeitsvorlaufs immer so gewählt werden, dass ein Optimum von Nachführstabilität und Genauigkeit erreicht wird.Secondly, the deviation of the real flow from the set point leads to a work flow that is not optimal. Since the image signal due to the environmental influences caused by the welding process (such as welding steam) gets worse, the smaller the feed is chosen (reducing Nachführstabilität), but on the other hand, the accuracy of the control decreases with increasing flow, must in scanner optics of the setpoint of Work always be chosen so that an optimum of Nachführstabilität and accuracy is achieved.
Aufgabe der Erfindung ist es, ein Verfahren zu finden, mit dem die Genauigkeit der Führung des Bearbeitungslasers in Fügevorrichtungen, die mittels einer Scanner-Optik gesteuert werden, auch bei längs zur zu erzeugenden Naht auftretenden Höhenschwankungen zwischen Scanner-Optik und Bauteil nachhaltig verbessert wird.The object of the invention is to find a method with which the accuracy of the guidance of the processing laser in joining devices by means of a scanner optics be controlled, even when longitudinally to the seam to be produced occurring height fluctuations between scanner optics and component is sustainably improved.
Diese Aufgabe wird erfindungsgemäß durch die Merkmale des Anspruchs 1 gelöst; vorteilhafte Ausgestaltungen der Erfindung ergeben sich aus den Ansprüchen 2 bis 10.This object is achieved by the features of
Das erfindungsgemäße Verfahren wird zur Steuerung einer Fügevorrichtung mit einem Bearbeitungslaser verwendet, deren Scanner-Optik mit mindestens einem externen Projektor ausgestattet ist. Der Projektor dient dazu, Messlicht in Form von Messstrukturen auf das zu bearbeitende Werkstück zu projizieren. Das Messlicht wird von einem mit der Scanner-Optik bewegten und im Wellenlängenbereich des Messlichts sensitiven Bildsensor erfasst. Die Scanner-Optik arbeitet nach dem Prinzip des pre-objektive-scanning oder des post-objective-scanning und wird mittels einer Führungsmaschine relativ zum zu bearbeitenden Werkstück bewegt. Der Strahlengang der Scanner-Optik ist mittels einer oder mehrerer aktiver und/oder passiver Ablenkungseinheiten geführt.The inventive method is used to control a joining device with a processing laser, the scanner optics is equipped with at least one external projector. The projector serves to project measuring light in the form of measuring structures onto the workpiece to be machined. The measuring light is detected by an image sensor moving with the scanner optics and sensitive in the wavelength range of the measuring light. The scanner optics operates on the principle of pre-objective scanning or post-objective scanning and is moved by means of a guide machine relative to the workpiece to be machined. The beam path of the scanner optics is guided by means of one or more active and / or passive deflection units.
Voraussetzung für die Anwendung des Verfahrens ist, dass der Projektor außerhalb des Strahlengangs der Scanner-Optik angeordnet und seine optische Achse gegenüber der optischen Achse des Lasers um 5° bis 60°, bevorzugt 10° bis 25°, gekippt ist. Das vom Projektor ausgestrahlte Messlicht besteht aus mindestens einer Linie, die quer zur Längsrichtung der zu erzeugenden Naht verläuft.Prerequisite for the application of the method is that the projector is located outside the beam path of the scanner optics and its optical axis with respect to the optical axis of the laser by 5 ° to 60 °, preferably 10 ° to 25 ° tilted. The measuring light emitted by the projector consists of at least one line which runs transversely to the longitudinal direction of the seam to be produced.
Nach Maßgabe der Erfindung wird während der Erzeugung der Schweißnaht der Vorgabewert des Vorlaufs des Messlichts gegenüber der Auftreffposition des Laserstrahls in Nahtlängsrichtung gezielt verändert. Alle bekannten Verfahren arbeiten mit einem festen Vorgabewert des Vorlaufs, der reale Vorlauf kann allerdings auch bei diesen Verfahren, wie oben bereits diskutiert, aus Geometriegründen variieren.According to the invention, during the generation of the weld, the default value of the flow of the measurement light relative to the impact position of the laser beam in the seam longitudinal direction is changed in a targeted manner. All known methods operate with a fixed default value of the flow, but the real flow can also vary in these methods, as discussed above, for geometric reasons.
Um den Vorlauf des Messlichts zur Auftreffposition des Laserstrahls (im Rahmen der apparativen Möglichkeiten) frei vorgeben zu können, wird ein Projektor eingesetzt, dessen Messlicht, z.B. durch Verändern seines Kippwinkels oder translatorisches Bewegen des gesamten Projektors oder mittels einer im ausgehenden Strahlengang des Projektors angeordneten, aktiven Umlenkungseinheit, unabhängig von der Führungsmaschine bewegt werden kann. Schließlich kann der Vorgabewert des Vorlaufs auch mittels der Scanner-Optik verändert werden.In order to freely specify the flow of the measurement light to the position of incidence of the laser beam (within the scope of the equipment), a projector is used, whose measurement light, for example, by changing its tilt angle or translational movement of the entire projector or by means arranged in the outgoing beam path of the projector, active deflection unit, can be moved independently of the guide machine. Finally, the default value of the forward can also be changed by means of the scanner optics.
Um den realen Arbeitsvorlauf auch bei Höhenschwankungen zwischen Scanner-Optik und Bauteil längs der zu erzeugenden Naht konstant zu halten, werden während der Erzeugung der Schweißnaht mit dem Bildsensor Bildsignale vom Messlicht aufgenommen.In order to keep the real work flow constant even with height fluctuations between the scanner optics and the component along the seam to be produced, image signals from the measuring light are recorded by the image sensor during the generation of the weld.
Dabei wird der Vorgabewert des Vorlaufs entweder vorerst fest auf dem Vorgabewert des Arbeitsvorlaufs gehalten oder der Vorgabewert des Vorlaufs wird zyklisch variiert. Im Falle des festen Vorgabewerts (des Vorlaufs) werden mit dem Bildsensor Bildsignale während der Erzeugung der Naht aufgenommen. Bei einem zyklisch variierten Vorgabewert werden die Bildsignale hingegen während jeder Variation, die üblicherweise mit dem Vorgabewert des Arbeitsvorlaufs beginnt und sich zu größeren Vorgabewerten (weiter vom Auftreffpunkt des Laserstrahls entfernte) hin erstreckt, aufgenommen.In this case, the default value of the flow is either initially held firmly on the default value of the workflow or the default value of the flow is cyclically varied. In the case of the fixed default value, the image sensor receives image signals during the generation of the seam. On the other hand, in the case of a cyclically varied default value, the image signals are recorded during each variation, which usually begins with the default value of the working advance and extends to larger default values (farther from the point of incidence of the laser beam).
Die zyklischen Variationen der Vorgabewerte des Vorlaufs können ausschließlich innerhalb des Bildbereichs des Bildsensors erfolgen, oder es wird der Bildbereich des Bildsensors, um noch größere Vorgabewerte des Vorlaufs (als die im Bildbereich des Bildsensors liegenden) zu erreichen, während der Variation der Vorgabewerte des Vorlaufs dem Messlicht mittels der Scanner-Optik nachgeführt. Bei der Nachführung des Bildsensors wird zwar, da der Arbeitslaser und der Bildsensor dieselbe Optik nutzen, auch der Arbeitslaser mitbewegt, die Variation der Vorgabewerte erfolgt jedoch in Grenzen (Geschwindigkeit, Amplitude), die vom Schweißprozess ohne Weiteres toleriert werden.The cyclical variations of the default values of the pre-scan can occur exclusively within the image area of the image sensor, or the image area of the image sensor to reach even greater pre-set values (than that in the image area of the image sensor) during the variation of the pre-set values Measuring light tracked by the scanner optics. While tracking the image sensor, since the working laser and the image sensor use the same optics, the working laser is also moved, but the variation of the default values is limited (speed, amplitude), which are readily tolerated by the welding process.
Aus den so gewonnenen Bildsignalen wird mittels eines Triangulationsverfahrens, vorzugsweise dem Lichtschnittverfahren, die Topologie des Werkstücks in der Umgebung der zu erzeugenden Naht ermittelt. Mit Hilfe der Topologiedaten (Höhenwerte) werden dann die Vorgabewerte für den Arbeitsvorlauf derart angepasst, dass über den gesamten Verlauf der zu erzeugenden Naht jeweils die durch Höhenschwankungen verursachten Abweichungen des realen Arbeitsvorlaufs vom Sollwert des Arbeitsvorlaufs kompensiert werden. Auf diese Weise kann der reale Arbeitsvorlauf auf seinem optimalen Wert gehalten werden und die von der Scanner-Optik ermittelten Korrekturwerte kommen an den dafür vorgesehenen Positionen zum Einsatz.From the image signals obtained in this way, the topology of the workpiece in the vicinity of the seam to be produced is determined by means of a triangulation method, preferably the light-section method. With the help of the topology data (height values), the default values for the work flow are then determined adjusted so that over the entire course of the seam to be produced in each case the deviations caused by height variations deviations of the real working approach are compensated by the target value of the work flow. In this way, the real work flow can be kept at its optimum value and the correction values determined by the scanner optics are used at the positions intended for this purpose.
Bei der Variante mit festen Vorgabewerten des Vorlaufs kann dabei lediglich auf die Topologiedaten vor und genau am Ort des Messlichts zurückgegriffen werden, während bei der Variante mit zyklischer Variation der Vorgabewerte des Vorlaufs auch in Vorschau, d.h. mit den Topologiedaten vor dem Ort des Messlichts gearbeitet, und infolgedessen noch genauer geregelt werden kann. Die Variante mit zyklischer Variation ist allerdings technologisch aufwendiger.In the variant with fixed default values of the flow, only the topology data before and exactly at the location of the measuring light can be used, while in the variant with cyclical variation of the default values of the flow also in preview, i. worked with the topology data in front of the place of the measuring light, and as a result can be regulated even more precisely. The variant with cyclic variation, however, is technologically more complex.
Das erfindungsgemäße Verfahren kann darüber hinaus auch dazu genutzt werden, den realen Arbeitsvorlauf nicht festzuhalten, sondern auf einen so kleinen Wert einzustellen, dass die Qualität der Bildsignale gerade noch so gut ist, dass sie zur Regelung genutzt werden können. Auf diese Weise wird es möglich, sich im Schweißprozess stets an das Optimum von Nachführstabilität und Genauigkeit der Regelung heranzutasten.In addition, the method according to the invention can also be used to not record the real work flow but to set it to such a small value that the quality of the image signals is just as good that they can be used for control. In this way, it is possible to always get used to the optimum of Nachführstabilität and accuracy of the control in the welding process.
Hierzu wird während der Erzeugung der Naht mit dem Bildsensor eine Anzahl von Einzelbildern pro Zeiteinheit aufgenommen, die größer ist (mindestens doppelt, üblicherweise fünfmal so groß) als die Anzahl der Einzelbilder, die zur Nahtführung erforderlich sind. Für jedes Einzelbild wird das Signal-/Rauschverhältnis bestimmt. Wenn das Signal-/Rauschverhältnis einen zuvor festgelegten Wert überschreitet, wird das Bild als gut (Gutbild) eingestuft, sobald dieser Wert unterschritten wird, wird das Bild als schlecht (Schlechtbild) gewertet. Aus den pro Zeiteinheit aufgenommen Einzelbildern wird der Fehlerquotient (Verhältnis von Schlechtbildern zu Gutbildern) ermittelt. Schließlich wird der Vorgabewert (um einen kleinen Wert, z.B. 0,1 bis 5 mm) des Vorlaufs erhöht, wenn der Fehlerquotient der Einzelbilder einen bestimmten Wert überschreitet und verringert (ebenfalls um einen kleinen Wert), sobald der Fehlerquotient einen bestimmten Wert unterschreitet. Das Aufnehmen der Einzelbilder und die anschließende Veränderung des Vorgabewerts des Vorlaufs erfolgt während des gesamten Schweißvorgangs.For this purpose, during the generation of the seam with the image sensor, a number of individual images per unit of time is taken, which is larger (at least twice, usually five times as large) as the number of individual images required for the seam guide. For each frame the signal-to-noise ratio is determined. If the signal / noise ratio exceeds a predetermined value, the image is classified as good (good image), as soon as this value is exceeded, the image is considered bad (bad image). The error quotient (ratio of bad images to good images) is determined from the individual images taken per time unit. Finally, the default value (by a small value, eg, 0.1 to 5 mm) of the leader is increased when the error quotient of the frames exceeds a certain value and decreases (also by a small value) as soon as the error quotient falls below a certain value. Recording the Single images and the subsequent change of the preset value of the flow takes place during the entire welding process.
Es ist auch möglich, diese Methode (Herantasten an den optimalen Arbeitsvorlauf) mit der Methode zur Kompensation der Verschiebung des realen Arbeitsvorlaufs aufgrund von Höhenänderungen zu kombinieren, indem in einem ersten, groben Regelschritt Höhenänderungen kompensiert und in einem zweiten, feinen Regelschritt der Arbeitsvorlauf anhand des Bildsignals weiter angepasst wird.It is also possible to combine this method (approaching the optimal working approach) with the method for compensating the displacement of the real working approach due to height changes by compensating for height changes in a first, coarse control step and in a second, fine control step the work flow based on the Image signal is further adjusted.
Des Weiteren ist das erfindungsgemäße Verfahren gut zur Kombination mit dem bereits bekannten, so genannten "on-the-Fly-Verfahren" geeignet, bei dem die Arbeitsgeschwindigkeit des Lasers temporär dadurch erhöht wird, dass zur Bewegung des Lasers durch die Führungsmaschine eine Bewegung des Lasers durch die Scanneroptik hinzugefügt wird.Furthermore, the method according to the invention is well suited for combination with the already known, so-called "on-the-fly method" in which the operating speed of the laser is temporarily increased by moving the laser to move the laser through the guide machine is added through the scanner optics.
Die Wirkungsweise des erfindungsgemäßen Verfahrens, eingesetzt zur Kompensation von Höhenänderungen, wird nachfolgend anhand der Figur, die eine Fügevorrichtung in seitlicher Ansicht zeigt, näher erläutert.The operation of the method according to the invention, used to compensate for changes in height, will be explained in more detail with reference to the figure, which shows a joining device in a side view.
Beim Auftreffen des vom Projektor 7 ausgesandten Messlichts 8, das hier aus einer Linie besteht, auf ein Werkstück 11, das nicht eben ist, sondern Erhebungen 12 oder Senken aufweist, würde die unkorrigierte Messlinie 8a bei einer Position 13a auf das Werkstück auftreffen. Bei der Berechnung der Korrekturen der Scanner-Optik würde jedoch von der Soll-Position 13b ausgegangen. Zwischen dem realen Arbeitsvorlauf (entsprechend Position 13a) und dem Sollwert des Arbeitsvorlaufs (entsprechend Position 13b) träte damit eine Abweichung 14 auf.Upon impact of the emitted from the
Mit Hilfe des Projektors 7, der über einen Freiheitsgrad 10 in Nahtlängsrichtung 9 verfügt, wird ständig eine zyklische Variation des Soll-Vorlaufs in Nahtlängsrichtung 9 durchgeführt und aus den dabei gewonnenen Bilddaten mit Hilfe des Lichtschnittverfahrens die Topologie des Werkstücks ermittelt. Die Abweichung 14 kann mittels der Topologiedaten dadurch kompensiert werden, dass die ursprüngliche (keine Kompensation des durch die Höhenänderung verursachten Fehlers) Messlinie 8a derart um einen Korrekturwinkel α gekippt wird (Kippen des Projektors 7 oder einer aktiven Ablenkungseinheit 3), dass der ursprüngliche, geometrisch verschobene Arbeitsvorlauf 13a auf den dem Sollwert entsprechenden Arbeitsvorlauf 13b geschwenkt wird (Messlinie 8b).With the help of the
So wird sichergestellt, dass einerseits der Arbeitsvorlauf zur Auftreffposition 6 des Bearbeitungslasers 1 bezüglich Nachführstabilität und Genauigkeit einem Optimum entspricht und andererseits die von der Scanner-Optik ermittelten Korrekturwerte an der vorgesehenen Position angewandt werden.This ensures that, on the one hand, the work flow to the
- 11
- Bearbeitungslaserlaser processing
- 22
- Scanner-OptikScanner optics
- 33
- Ablenkungseinheitdeflection unit
- 44
- LaserbearbeitungsstrahlLaser processing beam
- 55
- Werkstückworkpiece
- 66
- Auftreffpositionlanding
- 77
- Projektorprojector
- 88th
- Messlicht/MesslinieMeasuring light / measurement line
- 8a8a
- ursprüngliche Messlinieoriginal measuring line
- 8b8b
- korrigierte Messliniecorrected measuring line
- 99
- NahtlängsrichtungSeam longitudinally
- 1010
- Projektor-Freiheitsgrade in NahtlängsrichtungProjector degrees of freedom in the seam longitudinal direction
- 1111
- WerkstückoberflächeWorkpiece surface
- 1212
- Erhebungsurvey
- 13a13a
- realer Arbeitsvorlaufsreal work progress
- 13b13b
- Sollwert des ArbeitsvorlaufsSetpoint of the work flow
- 1414
- Abweichung des ArbeitsvorlaufsDeviation of the work process
- αα
- KorrekturvvinkelKorrekturvvinkel
Claims (10)
umfasst.
includes.
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DE102010060162A DE102010060162B3 (en) | 2010-08-12 | 2010-10-26 | Controlling a device for welding using a laser beam emitted by a laser, where the device has a scanner optical unit, a projector and an image sensor, comprises arranging the projector outside of a beam path of the scanner optical unit |
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DE102010060162B3 (en) | 2011-12-08 |
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